Bloody Vomit was a death metal band from Belo Horizonte, Brazil, active in the early 2020s before splitting up. The band released the demo "He's Dead" and drew on the raw, aggressive traditions of the Brazilian extreme metal underground. They were active on SoundCloud and Bandcamp during their brief existence.

Bodhum is a death metal and grindcore band from Rio de Janeiro, Brazil, active since 2010. The band debuted with the EP "Sobre Homens E Porcos" in 2010 and has since released additional albums including "Causa Mortis", "Consórcio da Morte", and "Extremo". They participated in the 2020 Brazilian tribute compilation "A Brazilian Tribute To Nasum: Mieszko Lives", released through The Grind Records.

Bonesawer is a death metal and grindcore band from Rio de Janeiro, Brazil, formed in 2024. The band plays aggressive extreme metal in the death/grind vein and is listed on Encyclopaedia Metallum as a current active act in Rio de Janeiro's underground scene.

Boto não é Golfinho was a death metal and grindcore band from Londrina, Paraná, Brazil, active until their 2022 split-up. The band played fast, abrasive extreme metal in the noisecore tradition, releasing the album "Parlamentáveis" in March 2022, a nine-track record with a combined runtime of just over ten minutes.

Brutal Abyss is a death metal band from Fortaleza, Ceará, Brazil, evolving from an earlier project known as Dry Curse. The band released their debut full-length "Misanthropic Butcher" in 2018 through Extreme Sound Records, a ten-track album praised for its quality and passion and noted for influences from 1990s bands such as Grave and Gorguts. The album received top marks from multiple Brazilian metal publications and earned the band a physical CD release distributed across Brazilian metal shops.

Brutal Masturbation is a death metal and grindcore band from the Patagonian city of Comodoro Rivadavia, Argentina, active since 2017. The band released the Aborto EP, delivering short blasts of death-grind in the tradition of South America's extreme underground.

Brutal Reality is an old school death metal band from São Paulo, Brazil, active since around 2020. The band plays straightforward death metal with themes centered on social disorder, chaos, and violence, operating as an independent act in Brazil's thriving underground death metal scene.

Brutta is a blackened death metal band formed in 2022, featuring São Paulo-based drummer Gledson Gonçalves alongside guitarist/vocalist Adriano Ribeiro (Athemon) and bassist Tom MacLean (ex-Haken). The band released their self-titled debut album in June 2022, a high-speed eight-track assault exploring themes of emptiness, hatred, and religion, followed by the album "Horror" in 2025.

Buena Muerte is a death metal band from Florencio Varela in the Buenos Aires metropolitan area of Argentina, featuring guitarist and vocalist Favio Leguizamon alongside bassist Jose Manuel Araujo and drummer Hector Benito Paz. The band released the Dios Es Sádico EP in 2018 and the full-length album Catalepsia in 2024, building a steady presence in Argentina's underground death metal scene over two decades.